Consolidated Statements of Shareholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balances at Dec. 31, 2009	$ 8	$ 27,871	$ 37,905	$ 769	$ (22,382)	$ 44,171
Purchase of treasury stock					(463)	(463)
Issuance of common shares for the exercise of stock options		274				274
Tax benefit from the exercise of options and vested restricted stock		46				46
Non-cash stock compensation expense		779				779
Dividends declared per common share			(5,061)			(5,061)
Other comprehensive income (loss), foreign currency translation adjustment				339		339
Net income			8,499			8,499
Balances at Dec. 31, 2010	8	28,970	41,343	1,108	(22,845)	48,584
Purchase of treasury stock					(591)	(591)
Issuance of common shares for the exercise of stock options		940				940
Tax benefit from the exercise of options and vested restricted stock		407				407
Non-cash stock compensation expense		763				763
Dividends declared per common share			(5,912)			(5,912)
Other comprehensive income (loss), foreign currency translation adjustment				(201)		(201)
Net income			11,564			11,564
Balances at Dec. 31, 2011	8	31,080	46,995	907	(23,436)	55,554
Purchase of treasury stock					(5,168)	(5,168)
Issuance of common shares for the exercise of stock options		5,968				5,968
Tax benefit from the exercise of options and vested restricted stock		2,078				2,078
Non-cash stock compensation expense		388				388
Dividends declared per common share			(17,363)			(17,363)
Other comprehensive income (loss), foreign currency translation adjustment				217		217
Net income			15,068			15,068
Balances at Dec. 31, 2012	$ 8	$ 39,514	$ 44,700	$ 1,124	$ (28,604)	$ 56,742